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A method for preparing aluminum samarium master alloy by sinking cathode molten salt electrolysis

A molten salt electrolysis and intermediate alloy technology, applied in electrolysis components, electrolysis process, electrodes, etc., can solve the problems of manpower consumption, difficulty in electrolytic cell design, etc., and achieve the effect of reducing Sm content and current efficiency

Active Publication Date: 2020-09-29
GANNAN NORMAL UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0006] The applicant found that although the above-mentioned patent solved the problem of idle current consumption in the electrolysis process, the aluminum-samarium intermediate alloy liquid would float on the surface of the molten salt liquid
When collecting products, researchers (or workers) need to scoop out the aluminum samarium intermediate alloy liquid on the surface of the molten salt, then cast it, and then peel off the molten salt for weighing and analysis after cooling, that is, the above method is only applicable to the laboratory Small test, if this method is applied to industrial production, workers need to scoop out a large amount of aluminum-samarium master alloy liquid on the surface of molten salt, which not only consumes manpower, but also brings certain difficulties to the design of electrolytic cells for industrial applications

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  • A method for preparing aluminum samarium master alloy by sinking cathode molten salt electrolysis
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  • A method for preparing aluminum samarium master alloy by sinking cathode molten salt electrolysis

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Embodiment

[0029] A method for preparing an aluminum samarium master alloy by sinking cathode molten salt electrolysis, comprising the following steps:

[0030] (1) Weigh the raw materials respectively: SmF 3 , LiF, K 3 AlF 6 、Sm 2 o 3 , aluminum ingots, to ensure that the mass ratio of raw materials is: (SmF 3 +LiF):K 3 AlF 6 =20:80-10:90, SmF 3 :LiF=75:25-90:10,Sm 2 o 3 The content is 1-3wt% of the total amount of molten salt, K 3 AlF 6 The content is 80-90wt% of the total amount of molten salt; and the weighed SmF 3 , LiF, K 3 AlF 6 、Sm 2 o 3 and aluminum ingots were dried and preheated at 200°C for 2 hours for later use.

[0031] (2) K after preheating in step (1) 3AlF 6 Put it into the electrolytic tank, heat up to 800-900°C, wait for K 3 AlF 6 Add preheated SmF after complete melting 3 and LiF; to be SmF 3 After the LiF is completely melted, add the preheated aluminum ingot, and add Sm after the aluminum ingot is melted 2 o 3 until melting;

[0032] (3) Car...

Embodiment 5

[0043] Embodiment 5 (SmF 3 +LiF:K 3 AlF 6 =40:60) of SmF 3 +LiF content is too high, the liquid aluminum is not in contact with the electrolytic cell and cannot be used as a cathode to conduct electricity (the density of the molten salt system is greater than that of liquid aluminum), so samarium cannot be electrolyzed.

[0044] (3) By the comparison of Example 3 and Example 7-9, it can be obtained that the increase of electrolysis temperature can effectively improve the current efficiency, but when the temperature is higher, the SmF 3 The solubility in the molten salt increases, and the samarium after electrolysis dissolves in the molten salt, which is not conducive to product separation. In addition, too high temperature will also cause K 3 AlF 6 Accelerated volatilization, resulting in increased costs, is not conducive to large-scale industrial production applications.

[0045] (4) embodiment 3, embodiment 10-13 are comparatively available, the Sm of embodiment 12 2 ...

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Abstract

The invention belongs to the technical field of metal materials, and particularly discloses a method for preparing an aluminum samarium intermediate alloy through sinking cathode fused salt electrolysis. The method comprises the following steps of: (1) weighing raw materials of SmF3, LiF, K3AlF6, Sm2O3, and aluminum ingots separately, and ensuring that the mass ratio of the raw materials is (SmF3+ LiF) : K3AlF6 = 20: 80-10: 90; (2) putting the K3AlF6 in the step (1) into an electrolytic cell, heating up, and adding SmF3 + LiF after the K3AlF6 is completely melted; and adding aluminum ingots after the SmF3 + LiF is completely melted, and adding Sm2O3 to melt after the aluminum ingots are melted; and (3) carrying out fused salt electrolysis, so that the prepared aluminum samarium intermediate alloys are immersed at the bottom of the electrolytic cell. According to the method for preparing aluminum samarium intermediate alloy through sinking cathode fused salt electrolysis, the method isenvironmentally friendly, and the production cost is low; the prepared aluminum samarium intermediate alloys are immersed at the bottom of molten salt; and the method is suitable for industrial massproduction applications.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and specifically discloses a method for preparing an aluminum samarium master alloy by electrolysis of a sinking cathode molten salt. Background technique [0002] Rare earth samarium is a white metal, mainly used in samarium cobalt magnetic materials. But at present, the application of samarium in other fields is also being continuously developed. For example, the solid solubility in magnesium reaches 5.8%, which can improve the performance of magnesium alloy through solid solution strengthening. In addition, samarium can significantly improve the comprehensive performance and corrosion resistance of aluminum alloys, and is widely used in the production and preparation of metal materials. [0003] The chemical activity of rare earth elements is high, easy to burn and segregate seriously. If rare earth metals are directly added to the alloy, the rare earth elements will be severely burne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C3/36C25C7/02
CPCC25C3/36C25C7/025
Inventor 杨初斌张小联张禛方玲韩宝军罗宁
Owner GANNAN NORMAL UNIV
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